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Almeida GFB, Cardoso MR, Aoki PHB, Lima JJD, Costa LDF, Rodrigues CA, Constantino CJL, Mendoncal CR. Surface Morphology and Structural Modification Induced by Femtosecond Pulses in Hydrogenated Amorphous Silicon Films. J Nanosci Nanotechnol 2015; 15:2495-2500. [PMID: 26413695 DOI: 10.1166/jnn.2015.9820] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work investigates the modification, resulting from fs-laser irradiation (150 fs, 775 nm and 1 kHz), on the structure and surface morphology of hydrogenated amorphous silicon (a-Si:H) thin films. The sample morphology was studied by performing a statistical analyzes of atomic force microscopy images, using a specially developed software that identifies and characterizes the domains (spikes) produced by the laser irradiation. For a fluence of 3.1 MJ/m2, we observed formation of spikes with smaller average height distribution, centered at around 15 nm, while for fluencies higher than 3.7 MJ/m2 aggregation of the produced spikes dominates the sample morphology. On the other hand, Raman spectroscopy revealed that a higher crystalline fraction (73%) is obtained for higher fluences (> 3.1 MJ/m2), which is accompanied by a decrease in the size of the produced crystals. Therefore, such results indicate that there is a trade-off between the spike distribution, crystallization fraction and size of the nanocrystals attained by laser irradiation, which has to be taken into account when using such approach for the development of devices.
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Ferreira GK, Cardoso MR, Jeremias IC, Gonçalves CL, Freitas KV, Antonini R, Scaini G, Rezin GT, Quevedo J, Streck EL. Fluvoxamine alters the activity of energy metabolism enzymes in the brain. ACTA ACUST UNITED AC 2014; 36:220-6. [PMID: 24676049 DOI: 10.1590/1516-4446-2013-1202] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 10/23/2013] [Indexed: 12/25/2022]
Abstract
OBJECTIVE Several studies support the hypothesis that metabolism impairment is involved in the pathophysiology of depression and that some antidepressants act by modulating brain energy metabolism. Thus, we evaluated the activity of Krebs cycle enzymes, the mitochondrial respiratory chain, and creatine kinase in the brain of rats subjected to prolonged administration of fluvoxamine. METHODS Wistar rats received daily administration of fluvoxamine in saline (10, 30, and 60 mg/kg) for 14 days. Twelve hours after the last administration, rats were killed by decapitation and the prefrontal cortex, cerebral cortex, hippocampus, striatum, and cerebellum were rapidly isolated. RESULTS The activities of citrate synthase, malate dehydrogenase, and complexes I, II-III, and IV were decreased after prolonged administration of fluvoxamine in rats. However, the activities of complex II, succinate dehydrogenase, and creatine kinase were increased. CONCLUSIONS Alterations in activity of energy metabolism enzymes were observed in most brain areas analyzed. Thus, we suggest that the decrease in citrate synthase, malate dehydrogenase, and complexes I, II-III, and IV can be related to adverse effects of pharmacotherapy, but long-term molecular adaptations cannot be ruled out. In addition, we demonstrated that these changes varied according to brain structure or biochemical analysis and were not dose-dependent.
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Affiliation(s)
- Gabriela K Ferreira
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
| | - Mariane R Cardoso
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
| | - Isabela C Jeremias
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
| | - Cinara L Gonçalves
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
| | - Karolina V Freitas
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
| | - Rafaela Antonini
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
| | - Giselli Scaini
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
| | - Gislaine T Rezin
- Clinical and Experimental Pathophysiology Laboratory, Graduate Program in Health Sciences, Universidade do Sul de Santa Catarina (UNISUL), Tubarão, SC, Brazil
| | - João Quevedo
- National Science and Technology Institute for Translational Medicine (INCT-TM), Porto Alegre, RS, Brazil
| | - Emilio L Streck
- Bioenergetics Laboratory, Center of Excellence in Applied Neurosciences of Santa Catarina (NENASC), Graduate Program in Health Sciences, Universidade do Extremo Sul Catarinense (UNESC), Criciúma, SC, Brazil
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Rezin GT, Scaini G, Gonçalves CL, Ferreira GK, Cardoso MR, Ferreira AG, Cunha MJ, Schmitz F, Varela RB, Quevedo J, Wyse AT, Streck EL. Evaluation of Na+, K+-ATPase activity in the brain of young rats after acute administration of fenproporex. Rev Bras Psiquiatr 2013; 36:138-42. [DOI: 10.1590/1516-4446-2012-0956] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Accepted: 11/24/2012] [Indexed: 11/21/2022]
Affiliation(s)
| | - Giselli Scaini
- Universidade do Extremo Sul Catarinense, Brazil; National Science and Technology Institute for Translational Medicine, Brazil
| | - Cinara L. Gonçalves
- Universidade do Extremo Sul Catarinense, Brazil; National Science and Technology Institute for Translational Medicine, Brazil
| | - Gabriela K. Ferreira
- Universidade do Extremo Sul Catarinense, Brazil; National Science and Technology Institute for Translational Medicine, Brazil
| | - Mariane R. Cardoso
- Universidade do Extremo Sul Catarinense, Brazil; National Science and Technology Institute for Translational Medicine, Brazil
| | | | | | | | - Roger B. Varela
- National Science and Technology Institute for Translational Medicine, Brazil; UNESC, Brazil
| | - João Quevedo
- National Science and Technology Institute for Translational Medicine, Brazil; UNESC, Brazil
| | | | - Emilio L. Streck
- Universidade do Extremo Sul Catarinense, Brazil; National Science and Technology Institute for Translational Medicine, Brazil
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Taha MO, Miranda-Ferreira R, Chang ACR, Rodrigues AM, Fonseca IS, Toral LB, Cardoso MR, Simões MJ, Oliveira-Junior IS, Monteiro HP, Fagundes DJ, Taha NSA, Caricati-Neto A. Effect of ischemic preconditioning on injuries caused by ischemia and reperfusion in rat intestine. Transplant Proc 2013; 44:2304-8. [PMID: 23026580 DOI: 10.1016/j.transproceed.2012.07.056] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
To study whether ischemic preconditioning (IPC) attenuated intestinal dysfunction caused by ischemia (I) and reperfusion (R), rats were underwent 60 minutes of I which was produced by occlusion of the superior mesenteric artery, and/or 120 minutes R. The IPC group had the I procedure previously stimulated for 5 minutes and the R for 10 minutes. IPC and sham groups were injected with saline solution (SS) via the femoral vein 5 minutes before the I and R, and for R. After I or I/R, 2-cm jejunal segments were mounted in an organ bath to study neurogenic contractions stimulated by electrical pulses or KCl using a digital recording system. Thin jejunal slices were stained with hematoxylin and eosin for optical microscopy. Compared with the sham group, jejunal contractions were similar in the IPC + I and the IPC + I/R groups, but reduced in the I + SS and the I/R + SS groups. The jejunal enteric nerves were damaged in the I + SS and the I/R + SS groups, but not in the IPC groups. These results suggested that ischemic preconditioning attenuated intestinal dysfunction caused by I and I/R.
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Affiliation(s)
- M O Taha
- Department of Pharmacology, Federal University of São Paulo (UNIFESP), São Paulo, Brazil.
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Rezin GT, Scaini G, Ferreira GK, Cardoso MR, Gonçalves CL, Constantino LS, Deroza PF, Ghedim FV, Valvassori SS, Resende WR, Quevedo J, Zugno AI, Streck EL. Inhibition of acetylcholinesterase activity in brain and behavioral analysis in adult rats after chronic administration of fenproporex. Metab Brain Dis 2012; 27:453-8. [PMID: 22832793 DOI: 10.1007/s11011-012-9331-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Accepted: 07/17/2012] [Indexed: 12/16/2022]
Abstract
Fenproporex is an amphetamine-based anorectic and it is rapidly converted in vivo into amphetamine. It elevates the levels of extracellular dopamine in the brain. Acetylcholinesterase is a regulatory enzyme which is involved in cholinergic synapses and may indirectly modulate the release of dopamine. Thus, we investigated whether the effects of chronic administration of fenproporex in adult rats alters acquisition and retention of avoidance memory and acetylcholinesterase activity. Adult male Wistar rats received repeated (14 days) intraperitoneal injection of vehicle or fenproporex (6.25, 12.5 or 25 mg/kg i.p.). For behavioral assessment, animals were submitted to inhibitory avoidance (IA) tasks and continuous multiple trials step-down inhibitory avoidance (CMIA). Acetylcholinesterase activity was measured in the prefrontal cortex, hippocampus, hypothalamus and striatum. The administration of fenproporex (6.25, 12.5 and 25 mg/kg) did not induce impairment in short and long-term IA or CMIA retention memory in rats. In addition, longer periods of exposure to fenproporex administration decreased acetylcholinesterase activity in prefrontal cortex and striatum of rats, but no alteration was verified in the hippocampus and hypothalamus. In conclusion, the present study showed that chronic fenproporex administration decreased acetylcholinesterase activity in the rat brain. However, longer periods of exposure to fenproporex did not produce impairment in short and long-term IA or CMIA retention memory in rats.
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Affiliation(s)
- Gislaine T Rezin
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Av. Universitária, 1105, Criciúma, 88806-000, SC, Brazil
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Gonçalves CL, Rezin GT, Ferreira GK, Jeremias IC, Cardoso MR, Carvalho-Silva M, Zugno AI, Quevedo J, Streck EL. Differential effects of escitalopram administration on metabolic parameters of cortical and subcortical brain regions of Wistar rats. Acta Neuropsychiatr 2012; 24:147-54. [PMID: 26953007 DOI: 10.1111/j.1601-5215.2011.00592.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Considering that mitochondria may be drug targets and some characteristics of drug-mitochondria interactions may still be misjudged because of the difficulty in foreseeing and understanding all possible implications of the complex pathophysiology of mitochondria, our study aimed to investigate the effect of escitalopram on the activity of enzymes of mitochondrial energy metabolism. METHODS Animals received daily administration of escitalopram dissolved in saline [10 mg/kg, intraperitoneal (IP)] at 1.0 ml/kg volume for 14 days. Control rats received an equivalent volume of saline, 1.0 ml/kg (IP), for the same treatment period. Twelve hours after last injection, rats were killed by decapitation and brain areas were rapidly isolated. The samples were homogenised and the activities of mitochondrial respiratory chain complexes, some enzymes of Krebs cycle (citrate synthase, malate dehydrogenase and succinate dehydrogenase) and creatine kinase were measured. RESULTS We verified that chronic administration of escitalopram decreased the activities of complexes I and II-III in cerebellum, hippocampus, striatum and posterior cortex whereas prefrontal cortex was not affected. Complex II activity was decreased only in striatum without affecting prefrontal cortex, hippocampus, cerebellum and posterior cortex. However, chronic administration of escitalopram did not affect complex IV and enzymes of Krebs cycle activities as well as creatine kinase. CONCLUSION In this study we showed a decrease in the activities of complexes I and II-III in most of the brain structures analysed and complex II activity was decreased only in striatum. However, it remains to be determined if mitochondrial dysfunction is rather a causal or a consequential event of abnormal signalling.
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Affiliation(s)
- Cinara L Gonçalves
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Gislaine T Rezin
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Gabriela K Ferreira
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Isabela C Jeremias
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Mariane R Cardoso
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Milena Carvalho-Silva
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Alexandra I Zugno
- Instituto Nacional de Ciência e Tecnologia Translacional em Medicina, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - João Quevedo
- Instituto Nacional de Ciência e Tecnologia Translacional em Medicina, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Emilio L Streck
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
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Ferreira GK, Rezin GT, Cardoso MR, Gonçalves CL, Borges LS, Vieira JS, Gomes LM, Zugno AI, Quevedo J, Streck EL. Brain energy metabolism is increased by chronic administration of bupropion. Acta Neuropsychiatr 2012; 24:115-21. [PMID: 26952953 DOI: 10.1111/j.1601-5215.2011.00597.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Based on the hypothesis that energy impairment may be involved in the pathophysiology of depression, we evaluated the activities of citrate synthase, malate dehydrogenase, succinate dehydrogenase (SDH), mitochondrial respiratory chain complexes I, II, II-III, IV and creatine kinase (CK) in the brain of rats submitted to chronic administration of bupropion. METHODS Animals received daily administration of bupropion dissolved in saline (10 mg/kg, intraperitoneal) at 1.0 ml/kg body weight. The rats received injections once a day for 14 days; control rats received an equivalent volume of saline. Twelve hours after the last administration, the rats were killed by decapitation and brain was rapidly removed and kept on an ice plate. The activities of the enzymes were measured in different brain areas. RESULTS We observed that the activities of citrate synthase and malate dehydrogenase, mithocondrial respiratory chain complexes I, II-III and IV and CK were not altered after chronic administration of bupropion. However, SDH activity was increased in the prefrontal cortex and cerebellum. In the hippocampus, cerebellum and striatum the activity of complex II was increased after chronic administration of bupropion. CONCLUSIONS Our results demonstrated that bupropion increased some enzymes of brain energy metabolism. These findings are in accordance with other studies which showed that some antidepressants may improve energy metabolism. The present results reinforce the hypothesis that antidepressants modulate brain energy metabolism.
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Affiliation(s)
- Gabriela K Ferreira
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Gislaine T Rezin
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Mariane R Cardoso
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Cinara L Gonçalves
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Lislaine S Borges
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Júlia S Vieira
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Lara M Gomes
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Alexandra I Zugno
- Instituto Nacional de Ciência e Tecnologia em Medicina Translacional, do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - João Quevedo
- Instituto Nacional de Ciência e Tecnologia em Medicina Translacional, do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Emilio L Streck
- Laboratório de Bioenergética, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
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Peruchi BB, Petronilho F, Rojas HA, Constantino L, Mina F, Vuolo F, Cardoso MR, Gonçalves CL, Rezin GT, Streck EL, Dal-Pizzol F. Skeletal muscle electron transport chain dysfunction after sepsis in rats. J Surg Res 2011; 167:e333-8. [PMID: 21316710 DOI: 10.1016/j.jss.2010.11.893] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Revised: 10/13/2010] [Accepted: 11/15/2010] [Indexed: 10/18/2022]
Abstract
BACKGROUND The derangement in oxygen utilization occurring during sepsis is likely to be linked to impaired mitochondrial functioning. Skeletal muscle comprises 50%-60% of body cell mass and represents the largest organ potentially affected by systemic inflammation. Thus, we investigated whether sepsis induced by cecal ligation and puncture (CLP) modifies mitochondrial activity in respiratory and nonrespiratory skeletal muscle. MATERIALS AND METHODS Wistar rats were subjected to CLP and at different times, diaphragm and quadriceps were removed for the determination of electron transfer chain activities and mitochondrial oxidative stress. In addition, we determined diaphragm contractile strength. RESULTS In the quadriceps, 12 h after CLP we demonstrated a significant diminution on complex II-III activity. At late times (48 h after CLP), we demonstrated a decrease in the activity of all electron transfer chain complexes, which seemed to be secondary to early oxidative stress and correlates with diaphragm contractile strength. Differently from diaphragm, electron transfer chain was not decreased after sepsis and even oxidative stress was not increased at all times tested. CONCLUSION Our results suggest that quadriceps mitochondria are more resistant to sepsis-induced dysfunction.
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Affiliation(s)
- Bruno B Peruchi
- Laboratório de Fisiopatologia Experimental, Programa de Pós-Graduação em Ciências da Saúde, Unidade Acadêmica de Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
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Rezin GT, Petronilho FC, Araújo JH, Gonçalves CL, Daufenbach JF, Cardoso MR, Roesler R, Schwartsmann G, Dal-Pizzol F, Streck EL. Gastrin-Releasing Peptide Receptor Antagonist or N-acetylcysteine combined with Omeprazol Protect against Mitochondrial Complex II Inhibition in a Rat Model of Gastritis. Basic Clin Pharmacol Toxicol 2010; 108:214-9. [DOI: 10.1111/j.1742-7843.2010.00645.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Barbosa PR, Cardoso MR, Daufenbach JF, Gonçalves CL, Machado RA, Roza CA, Scaini G, Rezin GT, Schuck PF, Dal-Pizzol F, Streck EL. Inhibition of mitochondrial respiratory chain in the brain of rats after renal ischemia is prevented by N-acetylcysteine and deferoxamine. Metab Brain Dis 2010; 25:219-25. [PMID: 20424907 DOI: 10.1007/s11011-010-9187-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Accepted: 11/05/2009] [Indexed: 12/26/2022]
Abstract
We evaluated the activities of mitochondrial respiratory chain complexes in the brain of rats after renal ischemia and the effect of administration of the antioxidants N-acetylcysteine (NAC) and deferoxamine (DFX). The rats were divided into the groups: sham (control) or renal ischemia treated with saline, NAC 20 mg/kg, DFX 20 mg/kg or both antioxidants. Complex I activity was inhibited in hippocampus, striatum, prefrontal cortex and cerebral cortex of rats 1 and 6 h after renal ischemia and that the treatment with a combination of NAC and DFX prevented such effect. Complex I activity was not altered in hippocampus, striatum, prefrontal cortex and cerebral cortex of rats 12 h after renal ischemia. Complexes II and III activities were not altered in hippocampus, striatum, prefrontal cortex and cerebral cortex of rats 1, 6 and 12 h after renal ischemia. Complex IV activity was inhibited in hippocampus, striatum, prefrontal cortex and cerebral cortex of rats 1 h after renal ischemia, but the treatment with the combination of NAC and DFX was able to prevent this inhibition. Complex IV activity was not altered in hippocampus, striatum, prefrontal cortex and cerebral cortex of rats 6 and 12 h after renal ischemia. These results suggest that the inhibition of mitochondrial respiratory chain after renal ischemia might play a role in the pathogenesis of uremic encephalopathy.
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Affiliation(s)
- Paulo R Barbosa
- Unidade Acadêmica de Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
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Sifroni KG, Damiani CR, Stoffel C, Cardoso MR, Ferreira GK, Jeremias IC, Rezin GT, Scaini G, Schuck PF, Dal-Pizzol F, Streck EL. Mitochondrial respiratory chain in the colonic mucosal of patients with ulcerative colitis. Mol Cell Biochem 2010; 342:111-5. [PMID: 20440543 DOI: 10.1007/s11010-010-0474-x] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Accepted: 04/17/2010] [Indexed: 02/06/2023]
Abstract
Ulcerative colitis (UC) is a chronic inflammatory disease of the large bowel. Its pathogenesis remains unclear, but it appears to result from a deregulated immune response, with infiltration of leukocytes into the mucosal interstitium. Several studies link oxidative stress and mitochondrial dysfunction to the pathogenesis of UC. Thus, the aim of this study was to evaluate the activities of mitochondrial respiratory chain complexes in the colonic mucosal of UC patients. Colonic biopsies were obtained from UC patients (n = 13). The control specimens were taken from patients without any history of inflammatory bowel disease (n = 8). Colon mucosal was removed by colonoscopy and homogenized. Mitochondrial respiratory chain complexes activities were then measured. Our results showed that the activity of complex I was not altered in UC patients, when compared to the control group. On the other hand, complexes II, III, and IV were decreased around 50-60% in the colonic mucosal of UC patients. Based on the present findings, we hypothesize that mitochondrial dysfunction may play a role in pathogenesis of UC.
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Affiliation(s)
- Karla G Sifroni
- Laboratório de Fisiopatologia Experimental and Instituto Nacional de Ciência e Tecnologia Translacional em Medicina, Programa de Pós-graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
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Rezin GT, Cardoso MR, Gonçalves CL, Scaini G, Fraga DB, Riegel RE, Comim CM, Quevedo J, Streck EL. Inhibition of mitochondrial respiratory chain in brain of rats subjected to an experimental model of depression. Neurochem Int 2008; 53:395-400. [DOI: 10.1016/j.neuint.2008.09.012] [Citation(s) in RCA: 154] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2008] [Revised: 09/19/2008] [Accepted: 09/22/2008] [Indexed: 12/27/2022]
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Comim CM, Rezin GT, Scaini G, Di-Pietro PB, Cardoso MR, Petronilho FC, Ritter C, Streck EL, Quevedo J, Dal-Pizzol F. Mitochondrial respiratory chain and creatine kinase activities in rat brain after sepsis induced by cecal ligation and perforation. Mitochondrion 2008; 8:313-8. [DOI: 10.1016/j.mito.2008.07.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2008] [Revised: 06/27/2008] [Accepted: 07/02/2008] [Indexed: 10/21/2022]
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Michaluart P, Abdallah KA, Lima FD, Smith R, Moysés RA, Coelho V, Victora GD, Socorro-Silva A, Volsi EC, Zárate-Bladés CR, Ferraz AR, Barreto AK, Chammas MC, Gomes R, Gebrim E, Arakawa-Sugueno L, Fernandes KP, Lotufo PA, Cardoso MR, Kalil J, Silva CL. Phase I trial of DNA-hsp65 immunotherapy for advanced squamous cell carcinoma of the head and neck. Cancer Gene Ther 2008; 15:676-84. [PMID: 18535616 DOI: 10.1038/cgt.2008.35] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Considering that mycobacterial heat-shock protein 65 (hsp65) gene transfer can elicit a profound antitumoral effect, this study aimed to establish the safety, maximum-tolerated dose (MTD) and preliminary efficacy of DNA-hsp65 immunotherapy in patients with advanced head and neck squamous cell carcinoma (HNSCC). For this purpose, 21 patients with unresectable and recurrent HNSCC were studied. Each patient received three ultrasound-guided injections at 21-day intervals of: 150, 600 or 400 microg of DNA-hsp65. Toxicity was graded according to CTCAE directions. Tumor volume was measured before and after treatment using computed tomography scan. The evaluation included tumor mass variation, delayed-type hypersensitivity response and spontaneous peripheral blood mononuclear cell proliferation before and after treatment. The MTD was 400 microg per dose. DNA-hsp65 immunotherapy was well tolerated with moderate pain, edema and infections as the most frequent adverse effects. None of the patients showed clinical or laboratory alterations compatible with autoimmune reactions. Partial response was observed in 4 out of 14 patients who completed treatment, 2 of which are still alive more than 3 years after the completion of the trial. Therefore, DNA-hsp65 immunotherapy is a feasible and safe approach at the dose of 400 microg per injection in patients with HNSCC refractory to standard treatment. Further studies in a larger number of patients are needed to confirm the efficacy of this novel strategy.
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Affiliation(s)
- P Michaluart
- HSP65 Clinical Trial Group, University of São Paulo, São Paulo, Brazil
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Zapelini PH, Rezin GT, Cardoso MR, Ritter C, Klamt F, Moreira JCF, Streck EL, Dal-Pizzol F. Antioxidant treatment reverses mitochondrial dysfunction in a sepsis animal model. Mitochondrion 2008; 8:211-8. [PMID: 18417427 DOI: 10.1016/j.mito.2008.03.002] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2008] [Revised: 02/28/2008] [Accepted: 03/03/2008] [Indexed: 10/22/2022]
Abstract
Evidence from the literature has demonstrated that reactive oxygen species (ROS) play an important role in the development of multiple organ failure and septic shock. In addition, mitochondrial dysfunction has been implicated in the pathogenesis of multiple organ dysfunction syndrome (MODS). The hypothesis of cytopathic hypoxia postulates that impairment in mitochondrial oxidative phosphorylation reduces aerobic adenosine triphosphate (ATP) production and potentially induces MODS. In this work, our aim was to evaluate the effects of antioxidants on oxidative damage and energy metabolism parameters in liver of rats submitted to a cecal ligation puncture (CLP) model of sepsis. We speculate that CLP induces a sequence of events that culminate with liver cells death. We propose that mitochondrial superoxide production induces mitochondrial oxidative damage, leading to mitochondrial dysfunction, swelling and release of cytochrome c. These events occur in early sepsis development, as reported in the present work. Liver cells necrosis only occurs 24 h after CLP, but all other events occur earlier (6-12 h). Moreover, we showed that antioxidants may prevent oxidative damage and mitochondrial dysfunction in liver of rats after CLP. In another set of experiments, we verified that L-NAME administration did not reverse increase of superoxide anion production, TBARS formation, protein carbonylation, mitochondrial swelling, increased serum AST or inhibition on complex IV activity caused by CLP. Considering that this drug inhibits nitric oxide synthase and that no parameter was reversed by its administration, we suggest that all the events reported in this study are not mediated by nitric oxide. In conclusion, although it is difficult to extrapolate our findings to human, it is tempting to speculate that antioxidants may be used in the future in the treatment of this disease.
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Affiliation(s)
- Paula H Zapelini
- Laboratório de Fisiopatologia Experimental, Programa de Pós-graduação em Ciências da Saúde, Unidade Acadêmica de Ciências da Saúde, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Criciúma 88006-000, SC, Brazil
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16
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Benicio MH, Cardoso MR, Gouveia NC, Monteiro CA. [Secular trends in respiratory diseases of childhood in the city of São Paulo, Brazil (1984-1996)]. Rev Saude Publica 2000; 34:91-101. [PMID: 11434324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023] Open
Abstract
OBJECTIVE Data from two consecutive household surveys undertaken in mid-80s and mid-90s allow to characterize and analyse secular trends in infant and child respiratory diseases in the city of S. Paulo, Brazil. METHODS The two surveys included random population samples aged from zero to 59 months (1,016 in the period of 1984-85 and 1,280 in 1995-96). In both surveys the instant prevalence of high respiratory diseases (above the epiglottis) and low respiratory diseases with or without wheezing were calculated. All sampled children were examined in their household at a random day by trained pediatricians using standardized procedures. The examinations included medical history, past respiratory diseases and a complete physical examination. In both surveys the examinations were distributed throughout a period of almost 12 months to assure a uniform coverage of the various areas of the city along the four seasons of the year. For each survey, the study of the social distribution of the diseases took into account tertiles of the per capita family income. For the study of the determinants of secular trends, hierarchical causal models, multivariate regression analyses and calculations analogous to the ones used to assess population attributable risks were applied. RESULTS/CONCLUSIONS In the time span from the first to the second survey, there was a substantial increase in the prevalence of both low (from 22.2% to 38.8%) and high respiratory diseases (from 6.0% to 10.0% and from 0.8% to 2.8%, without and with wheezing, respectively). In the case of high respiratory disease and low respiratory disease without wheezing, an increase in prevalence was observed among all social strata, which did not interfere with the slightly less favourable situation of the lower income groups. In the case of low respiratory disease with wheezing, the increase was only observed among middle and low-income groups, being particularly high among the lower income group, yielding a significant inverse gradient between income and respiratory disease. Positive changes in distal (family income and maternal schooling) and in intermediate determinants related to housing characteristics would have resulted in a decline, not an increase, in the prevalence of respiratory diseases in the city. The duplication in the attendance rate to day care nurseries seen in the period could have counterbalanced the positive effect due to socioeconomic and housing variables but would not be enough to explain an increase in the disease.
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Affiliation(s)
- M H Benicio
- Departamento de Nutrição da Faculdade de Saúde Pública da Universidade de São Paulo, São Paulo, SP, Brasil.
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Cardoso MR, Cousens SN, Alves FM, Ribeiro MM, Abreu Neto BP. Diagnosis and prognosis of wheezing disorders in young children in the city of São Paulo, Southeast Brazil. Acta Paediatr 2000; 89:1484-9. [PMID: 11195241 DOI: 10.1080/080352500456697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/30/2022]
Abstract
UNLABELLED Three-hundred-and-ninety-seven children aged 2-59 mo presenting to the paediatric emergency departments of five public hospitals in São Paulo, Brazil, with an acute episode of lower respiratory disease were examined. The children were classified into the following diagnostic categories: acute bronchitis, acute bronchiolitis, pneumonia, asthma, post-bronchiolitis wheezing and wheezing of uncertain aetiology. Three years after the initial study, the homes of the children diagnosed as asthmatic or as having wheezing of uncertain aetiology were visited to collect information on subsequent episodes of lower respiratory disease. This paper reports the proportional incidence of different categories of lower respiratory disease and the results of an analysis to investigate clinical features that might distinguish wheezing children between those with asthma and those with an infectious disease. The predictions made for children with wheezing of uncertain aetiology were then compared with the follow-up data. Recurrent wheezing disorders (asthma, post-bronchiolitis wheezing) were common in the study sample (47% of children). Thirty-six percent of children with an initial diagnosis of wheezing of uncertain aetiology were diagnosed as asthmatic by another doctor over the next 3 y. We were unable to identify any clinical features that were useful in identifying those children likely to be diagnosed subsequently as asthmatic. CONCLUSIONS The use of a diagnostic category similar to that which we have called "wheezing of uncertain aetiology" might help to alert physicians early to the possibility of asthma without interfering in the management of the illness. Such a classification might also be useful in epidemiological investigations of the aetiology of lower respiratory diseases.
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Affiliation(s)
- M R Cardoso
- Faculdade de Saúde Pública, Departamento de Epidemiologia, Universidade de São Paulo, Brazil.
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Cesar CL, Figueiredo GM, Westphal MF, Cardoso MR, Costa MZ, Gattás VL. [Referred morbidity and the utilization of health services in Brazilian urban areas: methodology]. Rev Saude Publica 1996; 30:153-60. [PMID: 9077014 DOI: 10.1590/s0034-89101996000200007] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The reorganization of the Brazilian health system in the last few years has been based on the decentralization of the services and the integration of preventive and curative medicine, then creating new needs in term of the health information needed for health planning. The planning and administration of a regionalized and integrated health system calls for information about the population's morbidity profile, and the description of the pattern of the utilization of the health services, which can be obtained by means of household health surveys. The methodology utilized in a household health survey carried out in the Metropolitan Area of S. Paulo, Brazil, from July 1989 to June 1990, is described. This survey has some distinct methodological characteristics, such as the sampling process that defined the domains by age and sex, allowing an analysis of populational groups less well represented in the general population, as that of less than one year of age and that of aged people, as well as the use of the results of the latest Brazilian Census in 1991 for adjusting the sample.
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Affiliation(s)
- C L Cesar
- Departamento de Epidemiologia da Faculdadae de Saúde Pública da Universidadae São Paulo, Brasil
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De Azevedo Neto RS, Silveira AS, Nokes DJ, Yang HM, Passos SD, Cardoso MR, Massad E. Rubella seroepidemiology in a non-immunized population of São Paulo State, Brazil. Epidemiol Infect 1994; 113:161-73. [PMID: 8062873 PMCID: PMC2271213 DOI: 10.1017/s095026880005158x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A rubella serological survey of 476 individuals selected by cluster sampling technique from Caieiras, a small town located in the outskirts of São Paulo city, southeastern Brazil, was carried out over the period November 1990-January 1991. The aim of the study was to characterize rubella epidemiology in a representative non-immunized community in south east Brazil. The survey comprised a seroprevalence study, stratified by age (0-40 years) and a seroconversion study of rubella vaccine in non-infected children below 2 years of age. Mathematical techniques were applied to resultant data sets to determine the age dependent rates of decay in the proportion of individuals with maternally derived antibodies, vaccine seroconversion, and infection of susceptibles, termed the force of infection, and to estimate the average age at first infection.
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